# a = 10
# b = 20

a = 'hello'
c = 'hello'
b = 'wello'

# str 可以直接 == != 进行比较
print(a < b)
print(a == b)
print(a == c)
print(a[0])


print(0.1 + 0.2)
print(0.1 + 0.2 == 0.3)
print(0.1 + 0.2 - 0.3)
print(- 0.000001 <0.1 + 0.2 - 0.3< 0.000001) # 支持连比

